OneBar - AI-powered Q&A knowledge base for Slack teams
Pocket - When you find something you want to view later, put it in Pocket.
Tettra - Tettra is a company wiki that helps teams manage and share organizational knowledge.
Raindrop.io - All your articles, photos, video & content from web & apps in one place.
Obie.ai - Access knowledge quicker without leaving Slack
Pingpad for Slack - For Slack teams to capture knowledge, organize and act on it